function unit of lung
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Answer:
The alveoli are the functional units of the lungs and they form the site of gaseous exchange.
Explanation:
Lung tissue consists mainly of alveoli (Figure 16.2. 6). These tiny air sacs are the functional units of the lungs where gas exchange takes place. The two lungs may contain as many as 700 million alveoli, providing a huge total surface area for gas exchange to take place
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